<template>
    <div>
      <!-- 面包屑导航 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>
      <el-card>
        <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>

        <!-- 步骤条区域 active默认选择第一个 步骤条-->
        <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>

        <!-- tab栏区域 -->
        <el-form :model="addForm" :rules="addRules" ref="addRuleForm" label-width="100px" label-position='top'>
          <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave='beforeTableLeave' @tab-click='tabClick'>
            <el-tab-pane label="基本信息" name="0">
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
              </el-form-item>
              <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader v-model="addForm.goods_cat" :options="cateList" :props="cateProps" @change="handleChange"></el-cascader>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
              <el-form-item :label="item.attr_name" v-for="(item,index) in manyTabDate" :key='item.attr_id'>
                <!-- 复选框组件 -->
                <el-checkbox-group v-model="item.attr_vals">
                  <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key='i' border></el-checkbox>
                </el-checkbox-group>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
              <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
                <!-- 输入框中的内容要和item中的vals双向绑后台数据是那个他就是那个 -->
                <el-input v-model="item.attr_vals"></el-input>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
              <!-- :on-success='handleSuccess'文件上传时的钩子函数 :headers='headersObj' 上传文件不使用axios所以没token，需要自己设置-->
              <el-upload
                :action='actionURL'
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :headers='headersObj'
                :on-success='handleSuccess'
                >
                <el-button size="small" type="primary">点击上传</el-button>
              </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
              <!-- 富文本编辑器 -->
              <quill-editor v-model="addForm.goods_introduce"></quill-editor>
              <el-button type="primary" class="add" @click="addOk">添加商品</el-button>
            </el-tab-pane>

          </el-tabs>
        </el-form>
      </el-card>

      <!-- 图片预览对话框 -->
      <el-dialog title="图片预览" :visible.sync="previewDialogVisible" width="50%">
        <img :src="previewPath" alt="" class="img">
      </el-dialog>
    </div>
</template>

<script>

export default {
  data () {
    return {
      activeIndex: '0',
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属分类的数组
        goods_cat: '',
        // 存放文件路径的数组
        pics: [],
        // 商品介绍
        goods_introduce: '',
        // 商品的参数（数组），包含 动态参数 和 静态属性(添加商品调接口时使用)
        attrs: []
      },
      addRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请输入商品分类', trigger: 'blur' }

        ]
      },
      cateList: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 动态分类参数
      manyTabDate: [],
      // 静态属性
      onlyTabData: [],
      actionURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 因为图片上传不发送axios所以出现无效的token。图片上传组件的headers请求头对象
      headersObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 存放图片预览的路径
      previewPath: '',
      // 图片预览窗口默认隐藏
      previewDialogVisible: false

    }
  },
  created () {
    // 获取商品分类数据列表
    this.getCateList()
  },
  mounted () {

  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取数据失败')
      }
      this.cateList = res.data
      console.log(this.cateList)
    },
    handleChange () {
      console.log(this.addForm.goods_cat)
      // 根据级联选择框双向绑定的addForm.goods_cat判断用户是否选择的是三级标题
      if (this.addForm.goods_cat.length !== 3) {
        // 不等于三的话就清空数组
        this.addForm.goods_cat = []
      }
    },
    // 切换标签之前的钩子，若返回 false 或者返回 Promise 且被 reject，则阻止切换。
    beforeTableLeave (activeName, oldActiveName) {
      /* console.log('即将离开的标签页'+oldActiveName);
        console.log('即将进入的标签页'+activeName); */
      if (oldActiveName == '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类')
        return false
      }
    },
    // tab被选中时触发
    async tabClick () {
      // console.log(this.activeIndex);
      // 等于1证明访问的是商品参数面板
      if (this.activeIndex === '1') {
        // console.log('选中了商品参数');
        // 发送请求，获取参数列表 id为分类id 从addfrom中获取，addform是一个数组所以需要添加计算属性
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'many' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败')
        }
        // 循环res.data中的attr_vals并将其转换为数组
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        // console.log(res);
        this.manyTabDate = res.data
        console.log(this.manyTabDate)
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败')
        }
        console.log(res)
        this.onlyTabData = res.data
        // console.log(this.onlyTabData);
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      console.log(file)
      this.previewPath = file.response.data.url
      this.previewDialogVisible = true
    },
    // 处理移出图片的操作
    handleRemove (file) {
      // console.log(file);
      // 1获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2从pics数组中，找到这个图片对应的索引值 (图片属性名叫pic(看下面))
      const i = this.addForm.pics.findIndex(x => {
        x.pic == filePath
      })
      // 3调用数组的splice方法，把图片信息对象从pics数组中移出
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 文件上传时的钩子函数
    handleSuccess (response) {
      console.log(response)
      // 1拼接得到一个图片信息对象 图片属性名叫pic
      // pic名字来源：接口文档
      const picInfo = { pic: response.data.tmp_path }
      // 2将图片信息对象push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm.pics)
    },
    // 添加商品按钮
    addOk () {
      // console.log(this.addForm);
      // 添加商品的表单预验证
      this.$refs.addRuleForm.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项！')
        }
        // 后续操作
        // this.addForm.goods_cat=this.addForm.goods_cat.join(',')
        this.addForm.goods_cat = this.addForm.goods_cat.join(',')
        console.log(this.addForm)
        // 处理动态参数
        this.manyTabDate.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            // 动态参数是字符串，用空格分开
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态参数
        this.onlyTabData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        // form.attrs=this.addForm.attrs
        console.log(this.addForm)
        const { data: res } = await this.$http.post('goods', this.addForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败')
        }
        this.$message.success('添加商品成功')
        console.log(res)
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      } else {
        return null
      }
    }
  }
}
</script>

<style scoped lang="less">
.el-checkbox{
  margin: 0 10px 0 10px;
}
.img{
  width: 100%;
}
.add{
  margin-top: 15px;
}
</style>
